Long Cylindrical Shell; Tube Worm?

[Neanderthal Shaman]

Was looking for crabs and clam shells in a Miocene deposit near Centralia WA. Was shocked to see what looked like PVC pipe sticking though a rock that was millions of years old. Tube itself is rather small, only about 2 inches in length, and 0.3 inches in diameter.  My best guess is that it's a tube worm's shell. Thoughts?

[Wrangellian]

It could be a scaphopod (Dentalium shell).. Can we see different views, eg. from the ends?

[TqB]

Can you tell if it's straight or not? Scaphopods are all curved to some degree I think, so straight would suggest serpulid. If curved, it could be either.

Edited June 25, 2020 by TqB

[MikeR]

Believe it or not, I think it is a bivalve.  The wood boring bivalve Teredo forms a calcitic tube as it feeds/burrows into wood.  Weaver in his 1958 monograph "Paleontology of the Marine Tertiary Formations of Oregon and Washington" lists Teredo pugetensis from the Puget group.  Below is a link to the substrate preferences of tube forming bivalves.

 

Mike

 

 

[Al Dente]

44 minutes ago, MikeR said:

Believe it or not, I think it is a bivalve.  The wood boring bivalve Teredo forms a calcitic tube as it feeds/burrows into wood.

Here's pictures of some. This is a small piece of wood I found washed up on the beach in North Carolina.

 

 

[Al Dente]

Here's another one, also from North Carolina.

 

 

[Neanderthal Shaman]

Here's a better picture. The tube is pretty straight, there might be a very slight amount of curvature to it.

Edited June 25, 2020 by Neanderthal Shaman